Spring Boot 2.0 (#721)

* Migration to Boot 2.0.

Signed-off-by: Kai Zimmermann <kai.zimmermann@microsoft.com>

hawkbit-dmf/hawkbit-dmf-amqp/pom.xml

@@ -59,9 +59,9 @@
          <artifactId>spring-boot</artifactId>
       </dependency>
       <dependency>
-         <groupId>com.fasterxml.jackson.core</groupId>
-         <artifactId>jackson-databind</artifactId>
-      </dependency>      
+         <groupId>org.springframework.boot</groupId>
+         <artifactId>spring-boot-starter-json</artifactId>
+      </dependency>
       <dependency>
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>